如何使用 java.awt 支持 ctrl + shift + numpad 键

Question

I want to associate ctrl + shift + numpad 7 to an action map. Basically I'm trying to bind my actions to keyboard shortcuts and want the same behavior as of the number keys pressed from top or number keypressed from right numbers of keyboard.

I'm able to map

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, KeyEvent.CTRL_DOWN_MASK | KeyEvent.SHIFT_DOWN_MASK), "Ctrl+4");

but cannot map

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_NUMPAD2, KeyEvent.CTRL_DOWN_MASK | KeyEvent.SHIFT_DOWN_MASK), "Ctrl+4");

Here is the code that I am trying to execute:

package testmaik;

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class KeyBindingsTest {

public static void main(String[] args) {
    new KeyBindingsTest();
}

public KeyBindingsTest() {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                ex.printStackTrace();
            }

            JFrame frame = new JFrame("Testing");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.add(new TestPane());
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }
    });
}

public class TestPane extends JPanel {

    private JLabel state;

    /**
     * 
     */
    public TestPane() {
        setLayout(new GridBagLayout());
        state = new JLabel("Nothing here");
        add(state);

        InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_1, KeyEvent.CTRL_DOWN_MASK), "Ctrl+1");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_2, KeyEvent.CTRL_DOWN_MASK), "Ctrl+2");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_NUMPAD1, KeyEvent.CTRL_DOWN_MASK), "Ctrl+1");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_NUMPAD2, KeyEvent.CTRL_DOWN_MASK), "Ctrl+2");
        im.put(KeyStroke.getKeyStroke("ctrl 7"), "ctrl+7");
        im.put(KeyStroke.getKeyStroke("ctrl shift 7"),  "Ctrl+3");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_NUMPAD2, KeyEvent.CTRL_DOWN_MASK | KeyEvent.SHIFT_DOWN_MASK), "Ctrl+4");

        ActionMap am = getActionMap();
        am.put("Ctrl+1", new MessageAction("Ctrl+1"));
        am.put("Ctrl+2", new MessageAction("Ctrl+2"));
        am.put("Ctrl+3", new MessageAction("Ctrl+3"));
        am.put("ctrl+7", new MessageAction("ctrl+7"));
        am.put("Ctrl+4", new MessageAction("Ctrl+4"));
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(200, 200);
    }

    public class MessageAction extends AbstractAction {

        private String message;

        public MessageAction(String message) {
            this.message = message;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            state.setText(message);
        }

    }

}

}

Please help.

Answer 1

An alternate solution: Try this im your TestPane class and you can catch the event itself:

getRootPane().getContentPane().getToolkit().addAWTEventListener(new AWTEventListener() {

        public void eventDispatched(final AWTEvent event) {
            if (event.getID() == KeyEvent.KEY_PRESSED) {
                final KeyEvent keyEvent = (KeyEvent) event;
                switch (keyEvent.getKeyCode()) {
                    case KeyEvent.VK_NUMPAD7:
                        if(keyEvent.isControlDown() && keyEvent.isShiftDown()) {
                            //do Stuff
                        }
                        break;
                }
            }
        }

    }, AWTEvent.KEY_EVENT_MASK);

I am not sure what's wrong with your event map.